Effect of grain boundary characteristics on hot tearing in directional solidification of superalloys

Beitrag in einer Fachzeitschrift
(Originalarbeit)


Details zur Publikation

Autor(en): Zhou Y, Volek A, Singer R
Zeitschrift: Journal of Materials Research
Jahr der Veröffentlichung: 2006
Band: 21
Heftnummer: 9
Seitenbereich: 2361-2370
ISSN: 0884-2914
Sprache: Englisch


Abstract


The effect of grain boundary (GB) misorientation on hot tearing susceptibility of directionally solidified (DS) nickel-based superalloys was explored. We found that the castability of second generation nickel-based superalloy CMSX-4 is inferior to DS superalloy IN792, an alloy well known for bad castability. The castability of CMSX-4 is somewhat improved at a higher solidification rate. The hot tearing tendency increases with increasing GB misorientation angle. As feeding tendency becomes greater with increasing misorientation, this points to the importance of GB cohesion for solidification cracking in the alloy. Microstructure investigation reveals that hot tearing is associated with formation of continuous gamma and gamma prime eutectic films at the GB in CMSX-4. We assume that the gamma and gamma prime eutectic, which reflects the remaining liquid at the end of solidification, prevents the impinging dendrite arms from touching and in this way decreases cohesion. © 2006 Materials Research Society.



FAU-Autoren / FAU-Herausgeber

Singer, Robert Prof. Dr.-Ing.
Lehrstuhl für Werkstoffwissenschaften (Werkstoffkunde und Technologie der Metalle)


Zitierweisen

APA:
Zhou, Y., Volek, A., & Singer, R. (2006). Effect of grain boundary characteristics on hot tearing in directional solidification of superalloys. Journal of Materials Research, 21(9), 2361-2370. https://dx.doi.org/10.1557/jmr.2006.0284

MLA:
Zhou, Yizhou, Andreas Volek, and Robert Singer. "Effect of grain boundary characteristics on hot tearing in directional solidification of superalloys." Journal of Materials Research 21.9 (2006): 2361-2370.

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Zuletzt aktualisiert 2018-10-08 um 15:54